Ink supply amount adjustment method and apparatus for printing press

a technology of printing press and amount adjustment, which is applied in the direction of printing press parts, printing, printing presses, etc., can solve the problems of increasing taking a very long time, and the need to restart proof printing, so as to reduce the amount of wasted paper

Inactive Publication Date: 2007-02-01
KOMORI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] It is an object of the present invention to provide an ink supply amount adjustment method and apparatus for a printing press, which can adjust an ink supply amount in a short period of time, and decrease the amount of wasted paper.
[0014] In order to achieve the above objects according to an aspect of the present invention, there is provided an ink supply amount adjustment method of a printing press including a plurality of ink fountain keys, an ink fountain roller which adjusts a supply amount of ink supplied from an ink fountain in accordance with an opening ratio of each of the ink fountain keys, and an ink ductor roller which supplies the ink supplied to the ink fountain roller to a printing plate through ink rollers by an ink feed operation, comprising the steps of measuring a density value of a printed paper sheet, correcting the opening ratio of the ink fountain key on the basis of a difference between a measured density value of the printed paper sheet and a preset reference density value, and performing the ink feed operation of the ink ductor roller without printing after correction of the opening ratio of the ink fountain key to increase or decrease the amount of ink on the ink rollers.
[0015] According to another aspect of the present invention, there is provided an ink supply amount adjustment apparatus of a printing press including a plurality of ink fountain keys, an ink fountain roller which adjusts a supply amount of ink supplied from an ink fountain in accordance with an opening ratio of each of the ink fountain keys, and an ink ductor roller which supplies the ink supplied to the ink fountain roller to a printing plate through ink rollers by an ink feed operation, comprising density value measurement means for measuring a density value of a printed paper sheet, opening ratio correction means for correcting the opening ratio of the ink fountain key on the basis of a difference between a measured density value of the printed paper sheet and a preset reference density value, and ink feed control means for performing the ink feed operation of the ink ductor roller without printing after correction of the opening ratio of the ink fountain key to increase or decrease the amount of ink on the ink rollers.

Problems solved by technology

Especially, in proof printing to obtain some printing products which are normally printed, it takes a very long time, and the amount of wasted paper increases to obtain some printing products which are normally printed.
However, in this method, proof printing must be restarted when a required number of printed products cannot be obtained by proof printing.
It takes a long time, and the amount of wasted print material increases.
In this method, since the ink is supplied to the entire surface of a paper sheet at the same ratio, the ink supply amount cannot be partially adjusted.
Especially, when the area to which the ink is excessively supplied and the area in which an ink shortage occurs are mixed, the ink supply amount cannot be sufficiently adjusted.

Method used

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  • Ink supply amount adjustment method and apparatus for printing press
  • Ink supply amount adjustment method and apparatus for printing press
  • Ink supply amount adjustment method and apparatus for printing press

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first embodiment

[0030]FIG. 1 shows a proof printing control device according to this embodiment of the present invention. A proof printing control device 10 comprises a CPU 10A, a RAM 10B, a ROM 10C, an input device 10D, a display device 10E, an output device 10F, a memory 10G, a colorimeter 10H, a colorimeter moving motor 10I, a rotary encoder 10J for the calorimeter moving motor, a motor driver 10K for moving the colorimeter, a counter 10L for measuring the current position of the colorimeter, an A / D converter 10M, a D / A converter 10N, a detector 10P for detecting the home position of the colorimeter, an internal clock counter 10Q, a driving motor 10R of a printing press, a driver 10S of a printing press driving motor, a rotary encoder 10T for the printing press driving motor, an F / V converter 10U, an A / D converter 10V, a detector 10W for detecting the home position of the printing press, counter 10X for counting total rotational speed of the printing press, a sheet feeding device 10Y, and input / ...

second embodiment

[0106] In the first embodiment, the reference correction amount of the ink fountain key opening ratio is multiplied by a predetermined correction coefficient (>1) to obtain the correction amount. This correction amount is added to the current ink fountain key opening ratio to obtain the ink fountain key opening ratio in the preliminary ink feed operation. In contrast to this, in the second embodiment, the reference correction amount of the ink fountain key opening ratio is added to the current ink fountain key opening ratio to obtain the ink fountain key opening ratio in the preliminary ink feed operation. In this case, the ink fountain key opening ratio of each color in the preliminary ink feed operation equals the ink fountain key opening ratio of each color in next proof printing. Hence, the ink fountain key opening ratio need not be adjusted after the preliminary ink feed operation.

[Schematic Operation in Second Embodiment]

[0107] (1) Each data is input.

[0108] (2) A proof prin...

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PUM

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Abstract

In an ink supply amount adjustment method, a density value of a printed paper sheet is measured. The ink fountain key opening ratio is corrected on the basis of a difference between the measured density value of the printed paper sheet and a preset reference density value. The ink feed operation of the ink ductor roller is performed without printing after correction of the ink fountain key opening ratio to increase or decrease the amount of ink on the ink rollers.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to an ink supply amount adjustment method and apparatus for a printing press, which adjusts the ink supply amount to a printing plate by adjusting the opening ratio of an ink fountain key. [0002] Generally, a rotary printing press includes a plurality of color printing units, and each color printing unit includes an inking device (inker). Referring to FIG. 12, the inking device comprises an ink fountain 1, ink 2 stored in the ink fountain 1, an ink fountain roller 3, a plurality of ink fountain keys 4-1 to 4-n juxtaposed in the axial direction of the ink fountain roller 3, an ink ductor roller 5, ink rollers 6, and a plate cylinder 8 on which a printing plate 7 is mounted. An image is printed on the printing plate 7. [0003] In this inking device, the ink 2 in the ink fountain 1 is supplied to the ink fountain roller 3 through the gap between the ink fountain keys 4-1 to 4-n and the ink fountain roller 3. The ink suppli...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B41F31/02
CPCB41F31/045B41P2233/11B41F33/0045
Inventor INDE, AKIHIROHIRANO, MASAHIRO
Owner KOMORI CORP
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